... This calibration approach is recommended when dealing with high frequency data from the old ATCA correlator, especially at 3mm wavelengths. ... The approach described here exploits the dual frequency bands that were available with the old correlator. ... Rather the current approach assumes that you have a single Miriad dataset containing bandpass calibrator, phase calibrator, flux density calibrator and program source. ... MFCAL . ... Input multi-source, dual-band dataset. select=source(1921-293) . ...

... The absolute photometric accuracy of FOC observations depends on several factors. ... The remaining errors most likely arise from: 1) errors in the published fluxes or variations in fluxes of the spectrophotometric stars used to calibrate the absolute DQE, 2) errors in the assumed PSFs, 3) errors in the assumed filter transmission curves, 4) format dependence effects, 5) temporal variability in the FOC detectors, and 6) the spectrum of the source. ... Errors in the assumed filter transmission curves...

... Archives . ... They find yearly modulation in their detected scintillation rate that matches what you would expect if the Earth were rushing through Galactic Dark Matter as it goes around the Sun. ... Significant! ... Certainly, at 8-sigma, it is easy to accept that there is modulation. ... Astronomers in general are extremely suspicious of any yearly modulations, as we have learnt from hard experience that it is an extremely common source of systematic error. ... Chandra Blog . ...

... We will consider the rms, (K), for observations with a receiver of system temperature, T , frequency resolution, per polarization, and total integration time per observing cycle, . ... For ``in-band'' frequency switching, the line under investigation is always in the observing band. ... Position Switching or ``Out-of-Band'' Frequency Switching: Here the line is only observed for one half of the time, with noise being present all of the time. ...

The success of any ALMA phase-calibration strategy, which incorporates phase transfer, depends on a good understanding of how the atmospheric path delay changes with frequency (e.g. Holdaway Pardo 2001). ... We find the wet dispersive path delay becomes a significant fraction ( 5 per cent) of the non-dispersive delay for the high-frequency ALMA bands ( 160 GHz, Bands 5 to 10). ... The full text of the memo is available here . ... Dispersive path delay . 2009 Emily Curtis ...

EPIC-pn Burst Mode X-ray loading and rate-dependent CTI calibration Jan-Uwe Ness ESAC 09 April 2015 XRL / RDCTI corrections in burst mode JU Ness ESAC , April 9 2015 Energy offsets caused by X-ray loading In 2010, significant effects from X-ray loading ( XRL ) were discovered in the timing mode and burst ... Thus the values of a0, a1, a2 control the rate dependent correction and are determined empirically. ...

... Paradoxically, signal detection is concerned with fitting models to supposedly random series similarly to mathematical proofs by reductio ad absurdum of the antithesis. ... The quality of the fit is evaluated using a function S of the series , , and . ... A random variable S is characterized by its probability distribution function. ... The special realization of a random series which consists of independent variables of common (gaussian) distribution is called (gaussian) white noise. ...

... HIGH-SPEED ULTRACAM COLORIMETRY OF THE SUBDWARF B STAR SDSS J171722.08+58055.8 C. Aerts 1 2 3 4 5 1,2 C.S. Jeffery3 V.S. Dhillon4 T.R. Marsh5 and P. Groot 2 Institute of Astronomy, University ... The data was obtained during 2 consecutive nights in 2004 August using the three-channel photometer ultracam attached to the 4.2m William Herschel Telescope. ... In this poster, we present ULTRACAM multicolour photometry of the sdB star SDSS J171722.08+58055.8 (hereafter abbreviated as SDSS 1717). ...

... Astro Space Center, Profsojuznaya 84/32, GSP-7, 117997, Moscow, Russia . ... The algorithm allows to work easily with the first and the second derivatives of a visibility function phases and amplitudes. This approach is important for high orbiting Space VLBI data processing. ... where is a measurements of the visibility function and is an approximating function. ... If is a 2-D complex function (a model), the bi-orthogonal approximation is known in VLBI as a self-calibration algorithm. ...

... Science . ... Science Users Information > Data Handling and Products > Data Reduction FAQ > Why do my flux-calibrated data not agree with independent photometric measurements? ... Observing with ESO Telescopes . ... ESO-MIDAS . ... Science Data Products Forum . ... ESO Data . ... With respect to the faction of flux contained within the slit one should keep in mind that the flux standard stars are observed with a 5'' wide slit, while science data are typically observed with slit widths of 0.8'' to 1'...

Next: A Gravitational Wave Map Previous: Critical Frequencies and Gravitational . In this section we consider the GWB spectrum as such, that is, we study how dimensionless strain metric amplitude h is dependent on frequency. For a sample of N independent binaries emitting GW at a given frequency the net result is . ... are, respectively, effective distance to the sample and effective mass of the binaries (in solar units) producing the GW radiation at the frequency . ...

... In order to successfully graduate from the University and receive a diploma, a student must pass exams in all required courses and in some elective courses, and then must write and defend a thesis. ... In order to become a student at the IUM, one had to take a written mathematical entrance exam in the end of June or in the beginning of September. ... Non-matriculated students who successfully complete the exams for the first semester become official students of the University. ...

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Feed cabin Nr. ... Fig. ... This allows to realize the sensitivity at frequency ranges 4.8, 11.2 and 30.0 GHz of 5, 7 and 12 mK by double beam switching mode and by the integration time of the output filter 1s. Input waveguide paths were very long and had big losses. ... The focal line of the feed cabin Nr. ... Data Acquisition and Control System . The Data acquisition system of the feed cabin Nr 2 is based on the new measurement ER-DAS system (Embedded Radiometric Data Acquisition System). ...

... Webometrics presented an updated version of the world ranking of universities, which assesses the presence of universities on the Internet. Since February 2014 Samara State Aerospace University has significantly improved its position in Russian as well as in the world part of ranking. Among the nearly 22 thousand universities in the world ranked by Webometrics experts, SSAU has risen immediately to 1267 positions and took the 2518-th place. ... Tags: webometrics world ranking of universities . ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... The results of long-term monitoring of Gigahertz-Peaked Spectrum sources were found the statistically significant differences (0.05 significance level) in the high-frequency spectral index distribution between subgroups of galaxies and quasars. ... This can mean that the electron energy distribution for GPS galaxies is steeper than for GPS quasars. ... The first area corresponds to GPS-quasars that have statistically larger value of redfhift, second area corresponds to GPS-galaxies. ...

... We start investigating the results from a non-magnetized (isotropic) plasma, before including the external magnetic field so important for space physics. ... propagating above the electron plasma frequency, w(pe) (reflection point for the waves) . note that, for very high frequencies, both phase and group velocities are equal to light velocity c, and we have electromagnetic wave in free space: even the electrons are unable to respond to the rapidly oscillating electric field! . ...

Elliptical galaxies Elliptical galaxies Rough subdivision · Normal ellipticals. ... Dwarf ellipticals (dE's). ... E dE BCD dSph 1013 - 1014 108 - 1013 107 - 109 109 107 - 108 300-1000 1-200 1-10 3 0.1­0.5 100 10­100 1­10 0.1­10 5­100 Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies ...

A comparative study of type I and type II supernovae . ... Sternberg State Astronomical Institute, Moscow, U.S.S.R. (Received 26 November, 1985) . ... No significant difference between SNe I and SNe II has been found in their radial distribution and frequency of outbursts in spiral galaxies. ... The radial distribution of type Ia SNe in spiral galaxies is only slightly steeper than the one for SNe II, while SNe Ib/c are more concentrated towards the central regions. ...